前言

例如，有一个Person类：
#import
#import “Book.h”

@interface Person : NSObject
@property(nonatomic,retain)NSString *name;
@property(nonatomic,retain)Book *book;
@end
#import “Person.h”

@implementation Person
– (void)dealloc
{
NSLog(@“人挂了。。。”);
[_name release];
[_book release];
[super dealloc];
}
@end

还有一个Book类：

#import

@interface Book : NSObject

/// 书名
@property(nonatomic,retain)NSString *name;
///作者名字
@property(nonatomic,retain)NSString *authorName;

///传播知识的方法
– (void)castZhiShi;
@end

#import “Book.h”

@implementation Book
– (void)dealloc
{
NSLog(@“书被烧了。。。”);
[_name release];
[_authorName release];